FILLER UP
When I need to hone a harmonic balancer or anything with a key slot, I use a body filler, commonly called Bondo, to fill it up and rough it close. That way the stones don’t catch on the edge of the slot, it does not clog the stones and it works quite well.

Randy Torvinen
Torvinen’s Machine
Menahga, MN
February, 2015